diff --git a/.arclint b/.arclint
--- a/.arclint
+++ b/.arclint
@@ -153,6 +153,13 @@
             "exclude": [
                 "(^src/(secp256k1|univalue)/)"
             ]
+        },
+        "lint-shell-locale": {
+            "type": "lint-shell-locale",
+            "include": "(\\.sh$)",
+            "exclude": [
+                "(^src/(secp256k1|univalue)/)"
+            ]
         }
     }
 }
diff --git a/arcanist/.phutil_module_cache b/arcanist/.phutil_module_cache
--- a/arcanist/.phutil_module_cache
+++ b/arcanist/.phutil_module_cache
@@ -1 +1 @@
-{"__symbol_cache_version__":11,"ae5b7d3d6b8cf9598ce4abaf0cd56b21":{"have":{"class":{"ExtendedConfigurationDrivenLintEngine":19}},"need":{"function":{"newv":159,"pht":933},"class":{"ArcanistLintEngine":65,"ArcanistConfigurationDrivenLintEngine":171,"PhutilConsole":866},"class\/interface":{"ILintOnce":634}},"xmap":{"ExtendedConfigurationDrivenLintEngine":["ArcanistLintEngine"]}},"2809b09d2021203b43c57da33d1fe8bf":{"have":{"class":{"AssertWithSideEffectsLinter":210}},"need":{"function":{"pht":439},"class":{"ArcanistLinter":246,"ArcanistLintSeverity":926,"Filesystem":1170}},"xmap":{"AssertWithSideEffectsLinter":["ArcanistLinter"]}},"90a8b110dc475955f15bb81d37268cb5":{"have":{"class":{"AutoPEP8FormatLinter":75}},"need":{"function":{"pht":297,"execx":769,"id":1903},"class":{"ArcanistExternalLinter":104,"ArcanistLintMessage":1910,"Filesystem":1754,"ArcanistLinter":2017,"ArcanistLintSeverity":2095}},"xmap":{"AutoPEP8FormatLinter":["ArcanistExternalLinter"]}},"4c4adcac26dddfa5e350b85a40097755":{"have":{"class":{"BashShebangLinter":82}},"need":{"function":{"pht":281},"class":{"ArcanistLinter":108,"ArcanistLintSeverity":597,"Filesystem":837}},"xmap":{"BashShebangLinter":["ArcanistLinter"]}},"5ea58c19df0397ed8ee0f463d90d6c72":{"have":{"class":{"BoostDependenciesLinter":145}},"need":{"function":{"pht":330,"id":1440},"class":{"GlobalExternalLinter":177,"ArcanistLintMessage":1447,"Filesystem":609,"ArcanistLinter":1524,"ArcanistLintSeverity":1624}},"xmap":{"BoostDependenciesLinter":["GlobalExternalLinter"]}},"38f0c676bff5192a344464142caaa253":{"have":{"class":{"CHeaderLinter":99}},"need":{"function":{"pht":611},"class":{"ArcanistLinter":121,"ArcanistLintSeverity":1060,"Filesystem":1307}},"xmap":{"CHeaderLinter":["ArcanistLinter"]}},"9bb48ec0fe2e9ced8e27d42540d0571c":{"have":{"class":{"CheckDocLinter":106}},"need":{"function":{"pht":321,"id":1845},"class":{"GlobalExternalLinter":129,"ArcanistLintMessage":1852,"Filesystem":729,"ArcanistLinter":1900,"ArcanistLintSeverity":1986}},"xmap":{"CheckDocLinter":["GlobalExternalLinter"]}},"63d19a8745cb2e1200cc26488dc7ad25":{"have":{"class":{"CheckRpcMappingsLinter":131}},"need":{"function":{"pht":310,"id":1386},"class":{"GlobalExternalLinter":162,"ArcanistLintMessage":1393,"Filesystem":573,"ArcanistLinter":1443,"ArcanistLintSeverity":1544}},"xmap":{"CheckRpcMappingsLinter":["GlobalExternalLinter"]}},"1c03a4631b02b8e1ebcc3a078dc1e4af":{"have":{"class":{"ClangFormatLinter":79}},"need":{"function":{"pht":302,"execx":781,"id":2235},"class":{"ArcanistExternalLinter":105,"ArcanistLintMessage":2242,"Filesystem":2086,"ArcanistLinter":2349,"ArcanistLintSeverity":2427}},"xmap":{"ClangFormatLinter":["ArcanistExternalLinter"]}},"75579a609dd975aa0226add52700c622":{"have":{"class":{"FileNameLinter":103}},"need":{"function":{"pht":307},"class":{"ArcanistLinter":126,"ArcanistLintSeverity":662,"Filesystem":968}},"xmap":{"FileNameLinter":["ArcanistLinter"]}},"9285ad9415f8ebe564f7119e5a72c559":{"have":{"class":{"FormatStringLinter":146}},"need":{"function":{"pht":377,"csprintf":1492,"id":1872},"class":{"ArcanistExternalLinter":173,"ArcanistLintMessage":1879,"Filesystem":827,"ArcanistLinter":1956,"ArcanistLintSeverity":2044}},"xmap":{"FormatStringLinter":["ArcanistExternalLinter"]}},"2e11dd9ad67e594f863bc46ac59ea37e":{"have":{"class":{"GlobalExternalLinter":199}},"need":{"class":{"ArcanistExternalLinter":228},"interface":{"ILintOnce":262}},"xmap":{"GlobalExternalLinter":["ArcanistExternalLinter","ILintOnce"]}},"b2403124ec3e8be6cb4d10bf0f6c4134":{"have":{"interface":{"ILintOnce":69}},"need":[],"xmap":[]},"1f9bac7956f4f948a187828dcc6ba2d0":{"have":{"class":{"IncludeGuardLinter":98}},"need":{"function":{"pht":368},"class":{"ArcanistLinter":125,"ArcanistLintSeverity":721,"Filesystem":970}},"xmap":{"IncludeGuardLinter":["ArcanistLinter"]}},"2cbb6e7228d81557f777ad648704f343":{"have":{"class":{"IncludeQuotesLinter":100}},"need":{"function":{"pht":306},"class":{"ArcanistLinter":128,"ArcanistLintSeverity":663,"Filesystem":964}},"xmap":{"IncludeQuotesLinter":["ArcanistLinter"]}},"f151089cf79fdb8257b2272ed4782d88":{"have":{"class":{"IncludeSourceLinter":99}},"need":{"function":{"pht":391},"class":{"ArcanistLinter":127,"ArcanistLintSeverity":699,"Filesystem":938}},"xmap":{"IncludeSourceLinter":["ArcanistLinter"]}},"8a0f2ba683e96feeb9d9564af01fe3e7":{"have":{"class":{"LocaleDependenceLinter":160}},"need":{"function":{"pht":5460},"class":{"ArcanistLinter":191,"ArcanistLintSeverity":5963,"Filesystem":6209}},"xmap":{"LocaleDependenceLinter":["ArcanistLinter"]}},"6f2f22dd0f259fb2eaa284b4fab3bc29":{"have":{"class":{"PythonFormatLinter":123}},"need":{"function":{"pht":353,"id":1838},"class":{"ArcanistExternalLinter":150,"ArcanistLintMessage":1845,"Filesystem":776,"ArcanistLinter":1970,"ArcanistLintSeverity":2053}},"xmap":{"PythonFormatLinter":["ArcanistExternalLinter"]}},"03cf226fe177a9fce7dc046816cc466b":{"have":{"class":{"PythonOpenFileEncodingLinter":111}},"need":{"function":{"pht":325},"class":{"ArcanistLinter":148,"ArcanistLintSeverity":687,"Filesystem":991}},"xmap":{"PythonOpenFileEncodingLinter":["ArcanistLinter"]}},"454160ed72e88797129d84ee589de304":{"have":{"class":{"PythonShebangLinter":87}},"need":{"function":{"pht":290},"class":{"ArcanistLinter":115,"ArcanistLintSeverity":614,"Filesystem":854}},"xmap":{"PythonShebangLinter":["ArcanistLinter"]}},"09a933fbbf135320585be52750d93831":{"have":{"class":{"StdintLinter":90}},"need":{"function":{"pht":280},"class":{"ArcanistLinter":111,"ArcanistLintSeverity":589,"Filesystem":897}},"xmap":{"StdintLinter":["ArcanistLinter"]}},"25781df78f6eebfb223296b8265e9d19":{"have":{"class":{"TestsLinter":103}},"need":{"function":{"pht":318,"id":2629},"class":{"ArcanistExternalLinter":123,"ArcanistLintMessage":2636,"Filesystem":776,"ArcanistLinter":2684,"ArcanistLintSeverity":2792}},"xmap":{"TestsLinter":["ArcanistExternalLinter"]}},"c5bb63c97d3e04f6e0906d001bd3f8a2":{"have":{"class":{"ShellCheckLinter":95}},"need":{"function":{"pht":921,"id":2137},"class":{"ArcanistExternalLinter":120,"ArcanistLintMessage":2144,"ArcanistLintSeverity":646,"ArcanistLinter":2192}},"xmap":{"ShellCheckLinter":["ArcanistExternalLinter"]}}}
\ No newline at end of file
+{"__symbol_cache_version__":11,"ae5b7d3d6b8cf9598ce4abaf0cd56b21":{"have":{"class":{"ExtendedConfigurationDrivenLintEngine":19}},"need":{"function":{"newv":159,"pht":933},"class":{"ArcanistLintEngine":65,"ArcanistConfigurationDrivenLintEngine":171,"PhutilConsole":866},"class\/interface":{"ILintOnce":634}},"xmap":{"ExtendedConfigurationDrivenLintEngine":["ArcanistLintEngine"]}},"2809b09d2021203b43c57da33d1fe8bf":{"have":{"class":{"AssertWithSideEffectsLinter":210}},"need":{"function":{"pht":439},"class":{"ArcanistLinter":246,"ArcanistLintSeverity":926,"Filesystem":1170}},"xmap":{"AssertWithSideEffectsLinter":["ArcanistLinter"]}},"90a8b110dc475955f15bb81d37268cb5":{"have":{"class":{"AutoPEP8FormatLinter":75}},"need":{"function":{"pht":297,"execx":769,"id":1903},"class":{"ArcanistExternalLinter":104,"ArcanistLintMessage":1910,"Filesystem":1754,"ArcanistLinter":2017,"ArcanistLintSeverity":2095}},"xmap":{"AutoPEP8FormatLinter":["ArcanistExternalLinter"]}},"4c4adcac26dddfa5e350b85a40097755":{"have":{"class":{"BashShebangLinter":82}},"need":{"function":{"pht":281},"class":{"ArcanistLinter":108,"ArcanistLintSeverity":597,"Filesystem":837}},"xmap":{"BashShebangLinter":["ArcanistLinter"]}},"5ea58c19df0397ed8ee0f463d90d6c72":{"have":{"class":{"BoostDependenciesLinter":145}},"need":{"function":{"pht":330,"id":1440},"class":{"GlobalExternalLinter":177,"ArcanistLintMessage":1447,"Filesystem":609,"ArcanistLinter":1524,"ArcanistLintSeverity":1624}},"xmap":{"BoostDependenciesLinter":["GlobalExternalLinter"]}},"38f0c676bff5192a344464142caaa253":{"have":{"class":{"CHeaderLinter":99}},"need":{"function":{"pht":611},"class":{"ArcanistLinter":121,"ArcanistLintSeverity":1060,"Filesystem":1307}},"xmap":{"CHeaderLinter":["ArcanistLinter"]}},"9bb48ec0fe2e9ced8e27d42540d0571c":{"have":{"class":{"CheckDocLinter":106}},"need":{"function":{"pht":321,"id":1845},"class":{"GlobalExternalLinter":129,"ArcanistLintMessage":1852,"Filesystem":729,"ArcanistLinter":1900,"ArcanistLintSeverity":1986}},"xmap":{"CheckDocLinter":["GlobalExternalLinter"]}},"63d19a8745cb2e1200cc26488dc7ad25":{"have":{"class":{"CheckRpcMappingsLinter":131}},"need":{"function":{"pht":310,"id":1386},"class":{"GlobalExternalLinter":162,"ArcanistLintMessage":1393,"Filesystem":573,"ArcanistLinter":1443,"ArcanistLintSeverity":1544}},"xmap":{"CheckRpcMappingsLinter":["GlobalExternalLinter"]}},"1c03a4631b02b8e1ebcc3a078dc1e4af":{"have":{"class":{"ClangFormatLinter":79}},"need":{"function":{"pht":302,"execx":781,"id":2235},"class":{"ArcanistExternalLinter":105,"ArcanistLintMessage":2242,"Filesystem":2086,"ArcanistLinter":2349,"ArcanistLintSeverity":2427}},"xmap":{"ClangFormatLinter":["ArcanistExternalLinter"]}},"75579a609dd975aa0226add52700c622":{"have":{"class":{"FileNameLinter":103}},"need":{"function":{"pht":307},"class":{"ArcanistLinter":126,"ArcanistLintSeverity":662,"Filesystem":968}},"xmap":{"FileNameLinter":["ArcanistLinter"]}},"9285ad9415f8ebe564f7119e5a72c559":{"have":{"class":{"FormatStringLinter":146}},"need":{"function":{"pht":377,"csprintf":1492,"id":1872},"class":{"ArcanistExternalLinter":173,"ArcanistLintMessage":1879,"Filesystem":827,"ArcanistLinter":1956,"ArcanistLintSeverity":2044}},"xmap":{"FormatStringLinter":["ArcanistExternalLinter"]}},"2e11dd9ad67e594f863bc46ac59ea37e":{"have":{"class":{"GlobalExternalLinter":199}},"need":{"class":{"ArcanistExternalLinter":228},"interface":{"ILintOnce":262}},"xmap":{"GlobalExternalLinter":["ArcanistExternalLinter","ILintOnce"]}},"b2403124ec3e8be6cb4d10bf0f6c4134":{"have":{"interface":{"ILintOnce":69}},"need":[],"xmap":[]},"1f9bac7956f4f948a187828dcc6ba2d0":{"have":{"class":{"IncludeGuardLinter":98}},"need":{"function":{"pht":368},"class":{"ArcanistLinter":125,"ArcanistLintSeverity":721,"Filesystem":970}},"xmap":{"IncludeGuardLinter":["ArcanistLinter"]}},"2cbb6e7228d81557f777ad648704f343":{"have":{"class":{"IncludeQuotesLinter":100}},"need":{"function":{"pht":306},"class":{"ArcanistLinter":128,"ArcanistLintSeverity":663,"Filesystem":964}},"xmap":{"IncludeQuotesLinter":["ArcanistLinter"]}},"f151089cf79fdb8257b2272ed4782d88":{"have":{"class":{"IncludeSourceLinter":99}},"need":{"function":{"pht":391},"class":{"ArcanistLinter":127,"ArcanistLintSeverity":699,"Filesystem":938}},"xmap":{"IncludeSourceLinter":["ArcanistLinter"]}},"8a0f2ba683e96feeb9d9564af01fe3e7":{"have":{"class":{"LocaleDependenceLinter":160}},"need":{"function":{"pht":5460},"class":{"ArcanistLinter":191,"ArcanistLintSeverity":5963,"Filesystem":6209}},"xmap":{"LocaleDependenceLinter":["ArcanistLinter"]}},"6f2f22dd0f259fb2eaa284b4fab3bc29":{"have":{"class":{"PythonFormatLinter":123}},"need":{"function":{"pht":353,"id":1838},"class":{"ArcanistExternalLinter":150,"ArcanistLintMessage":1845,"Filesystem":776,"ArcanistLinter":1970,"ArcanistLintSeverity":2053}},"xmap":{"PythonFormatLinter":["ArcanistExternalLinter"]}},"03cf226fe177a9fce7dc046816cc466b":{"have":{"class":{"PythonOpenFileEncodingLinter":111}},"need":{"function":{"pht":325},"class":{"ArcanistLinter":148,"ArcanistLintSeverity":687,"Filesystem":991}},"xmap":{"PythonOpenFileEncodingLinter":["ArcanistLinter"]}},"454160ed72e88797129d84ee589de304":{"have":{"class":{"PythonShebangLinter":87}},"need":{"function":{"pht":290},"class":{"ArcanistLinter":115,"ArcanistLintSeverity":614,"Filesystem":854}},"xmap":{"PythonShebangLinter":["ArcanistLinter"]}},"c5bb63c97d3e04f6e0906d001bd3f8a2":{"have":{"class":{"ShellCheckLinter":95}},"need":{"function":{"pht":921,"id":2137},"class":{"ArcanistExternalLinter":120,"ArcanistLintMessage":2144,"ArcanistLintSeverity":646,"ArcanistLinter":2192}},"xmap":{"ShellCheckLinter":["ArcanistExternalLinter"]}},"09a933fbbf135320585be52750d93831":{"have":{"class":{"StdintLinter":90}},"need":{"function":{"pht":280},"class":{"ArcanistLinter":111,"ArcanistLintSeverity":589,"Filesystem":897}},"xmap":{"StdintLinter":["ArcanistLinter"]}},"25781df78f6eebfb223296b8265e9d19":{"have":{"class":{"TestsLinter":103}},"need":{"function":{"pht":318,"id":2629},"class":{"ArcanistExternalLinter":123,"ArcanistLintMessage":2636,"Filesystem":776,"ArcanistLinter":2684,"ArcanistLintSeverity":2792}},"xmap":{"TestsLinter":["ArcanistExternalLinter"]}},"f0c1b22483ab7513a0e43189c6138f48":{"have":{"class":{"ShellLocaleLinter":80}},"need":{"function":{"pht":322},"class":{"ArcanistLinter":106,"ArcanistLintSeverity":641,"Filesystem":949}},"xmap":{"ShellLocaleLinter":["ArcanistLinter"]}}}
\ No newline at end of file
diff --git a/arcanist/__phutil_library_map__.php b/arcanist/__phutil_library_map__.php
--- a/arcanist/__phutil_library_map__.php
+++ b/arcanist/__phutil_library_map__.php
@@ -30,6 +30,7 @@
     'PythonOpenFileEncodingLinter' => 'linter/PythonOpenFileEncodingLinter.php',
     'PythonShebangLinter' => 'linter/PythonShebangLinter.php',
     'ShellCheckLinter' => 'linter/ShellCheckLinter.php',
+    'ShellLocaleLinter' => 'linter/ShellLocaleLinter.php',
     'StdintLinter' => 'linter/StdintLinter.php',
     'TestsLinter' => 'linter/TestsLinter.php',
   ),
@@ -58,6 +59,7 @@
     'PythonOpenFileEncodingLinter' => 'ArcanistLinter',
     'PythonShebangLinter' => 'ArcanistLinter',
     'ShellCheckLinter' => 'ArcanistExternalLinter',
+    'ShellLocaleLinter' => 'ArcanistLinter',
     'StdintLinter' => 'ArcanistLinter',
     'TestsLinter' => 'ArcanistExternalLinter',
   ),
diff --git a/arcanist/linter/ShellLocaleLinter.php b/arcanist/linter/ShellLocaleLinter.php
new file mode 100644
--- /dev/null
+++ b/arcanist/linter/ShellLocaleLinter.php
@@ -0,0 +1,56 @@
+<?php
+
+/**
+ * Enforce using `export LC_ALL=C` in shell scripts.
+ */
+final class ShellLocaleLinter extends ArcanistLinter {
+
+  const INVALID_LOCALE = 1;
+  const LOCALE_STATEMENT = 'export LC_ALL=C';
+
+  public function getInfoName() {
+    return 'lint-shell-locale';
+  }
+
+  public function getInfoDescription() {
+    return pht('Enforce using `'.self::LOCALE_STATEMENT.'` in shell scripts.');
+  }
+
+  public function getLinterName() {
+    return 'SHELL_LOCALE';
+  }
+
+  public function getLinterConfigurationName() {
+    return 'lint-shell-locale';
+  }
+
+  public function getLintSeverityMap() {
+    return array(
+        self::INVALID_LOCALE => ArcanistLintSeverity::SEVERITY_ERROR,
+    );
+  }
+
+  public function getLintNameMap() {
+    return array(
+        self::INVALID_LOCALE => pht('`'.self::LOCALE_STATEMENT.'` should be '.
+                                    'the first statement.'),
+    );
+  }
+
+  public function lintPath($path) {
+    $absPath = Filesystem::resolvePath($path, $this->getProjectRoot());
+    $fileContent = Filesystem::readFile($absPath);
+
+    if (!preg_match_all('/^[^#\s]+.+/m', $fileContent, $matches)) {
+      throw new Exception(pht('Error while parsing %s: the script seems to '.
+                              'have only comments and/or empty lines.', $path));
+    }
+
+    if (!(trim($matches[0][0]) === self::LOCALE_STATEMENT)) {
+      return $this->raiseLintAtPath(
+        self::INVALID_LOCALE,
+        pht('Shell scripts should set the locale to avoid side effects.')
+      );
+    }
+  }
+}
diff --git a/autogen.sh b/autogen.sh
--- a/autogen.sh
+++ b/autogen.sh
@@ -3,6 +3,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 set -e
 srcdir="$(dirname $0)"
 cd "$srcdir"
diff --git a/contrib/devtools/gen-manpages.sh b/contrib/devtools/gen-manpages.sh
--- a/contrib/devtools/gen-manpages.sh
+++ b/contrib/devtools/gen-manpages.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 
+export LC_ALL=C
 TOPDIR=${TOPDIR:-$(git rev-parse --show-toplevel)}
 BUILDDIR=${BUILDDIR:-$TOPDIR}
 
diff --git a/contrib/gitian-signing/check-keys.sh b/contrib/gitian-signing/check-keys.sh
--- a/contrib/gitian-signing/check-keys.sh
+++ b/contrib/gitian-signing/check-keys.sh
@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+
+export LC_ALL=C
+
 # Fetch latest signers' keys. We do this in order to check if a key was revoked.
 while read fingerprint _
 do
diff --git a/contrib/gitian/provisioner.sh b/contrib/gitian/provisioner.sh
--- a/contrib/gitian/provisioner.sh
+++ b/contrib/gitian/provisioner.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+export LC_ALL=C
+
 set -e
 
 # User to setup for building.  Vagrant is the default
diff --git a/contrib/macdeploy/detached-sig-apply.sh b/contrib/macdeploy/detached-sig-apply.sh
--- a/contrib/macdeploy/detached-sig-apply.sh
+++ b/contrib/macdeploy/detached-sig-apply.sh
@@ -3,6 +3,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 set -e
 
 UNSIGNED="$1"
diff --git a/contrib/macdeploy/detached-sig-create.sh b/contrib/macdeploy/detached-sig-create.sh
--- a/contrib/macdeploy/detached-sig-create.sh
+++ b/contrib/macdeploy/detached-sig-create.sh
@@ -3,6 +3,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 set -e
 
 ROOTDIR=dist
diff --git a/contrib/macdeploy/extract-osx-sdk.sh b/contrib/macdeploy/extract-osx-sdk.sh
--- a/contrib/macdeploy/extract-osx-sdk.sh
+++ b/contrib/macdeploy/extract-osx-sdk.sh
@@ -3,6 +3,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 set -e
 
 INPUTFILE="Xcode_7.3.1.dmg"
diff --git a/contrib/qos/tc.sh b/contrib/qos/tc.sh
--- a/contrib/qos/tc.sh
+++ b/contrib/qos/tc.sh
@@ -4,6 +4,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 #network interface on which to limit traffic
 IF="eth0"
 #limit of the network interface in question
diff --git a/contrib/teamcity/build-configurations.sh b/contrib/teamcity/build-configurations.sh
--- a/contrib/teamcity/build-configurations.sh
+++ b/contrib/teamcity/build-configurations.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+export LC_ALL=C
+
 set -e
 
 if [ -z "$ABC_BUILD_NAME" ]; then
diff --git a/contrib/teamcity/build-secp256k1.sh b/contrib/teamcity/build-secp256k1.sh
--- a/contrib/teamcity/build-secp256k1.sh
+++ b/contrib/teamcity/build-secp256k1.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+export LC_ALL=C
+
 set -eu
 
 TOPLEVEL=$(git rev-parse --show-toplevel)
diff --git a/contrib/teamcity/build.sh b/contrib/teamcity/build.sh
--- a/contrib/teamcity/build.sh
+++ b/contrib/teamcity/build.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+export LC_ALL=C
+
 set -eu
 
 TOPLEVEL=$(git rev-parse --show-toplevel)
diff --git a/contrib/teamcity/gitian.sh b/contrib/teamcity/gitian.sh
--- a/contrib/teamcity/gitian.sh
+++ b/contrib/teamcity/gitian.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+export LC_ALL=C
+
 set -e
 
 cd "$(dirname "$0")"
diff --git a/contrib/teamcity/ibd.sh b/contrib/teamcity/ibd.sh
--- a/contrib/teamcity/ibd.sh
+++ b/contrib/teamcity/ibd.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+export LC_ALL=C
+
 set -euo pipefail
 
 ###
diff --git a/contrib/verifybinaries/verify.sh b/contrib/verifybinaries/verify.sh
--- a/contrib/verifybinaries/verify.sh
+++ b/contrib/verifybinaries/verify.sh
@@ -10,6 +10,7 @@
 ###   The script returns 0 if everything passes the checks. It returns 1 if either the
 ###   signature check or the hash check doesn't pass. If an error occurs the return value is 2
 
+export LC_ALL=C
 function clean_up {
    for file in "$@"
    do
diff --git a/share/genbuild.sh b/share/genbuild.sh
--- a/share/genbuild.sh
+++ b/share/genbuild.sh
@@ -3,6 +3,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 if [ $# -gt 1 ]; then
     cd "$2" || exit 1
 fi
diff --git a/src/qt/res/movies/makespinner.sh b/src/qt/res/movies/makespinner.sh
--- a/src/qt/res/movies/makespinner.sh
+++ b/src/qt/res/movies/makespinner.sh
@@ -4,6 +4,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 FRAMEDIR=$(dirname $0)
 for i in {0..35}
 do
diff --git a/test/functional/test_framework/tests/run_self_tests.sh b/test/functional/test_framework/tests/run_self_tests.sh
--- a/test/functional/test_framework/tests/run_self_tests.sh
+++ b/test/functional/test_framework/tests/run_self_tests.sh
@@ -9,6 +9,8 @@
 # You should be able to call this script from pretty much anywhere.
 # It takes care of setting up the PYTHONPATH so tests can run.
 
+export LC_ALL=C
+
 # Enable exit on any error.
 set -e
 
diff --git a/test/lint/lint-boost-dependencies.sh b/test/lint/lint-boost-dependencies.sh
--- a/test/lint/lint-boost-dependencies.sh
+++ b/test/lint/lint-boost-dependencies.sh
@@ -6,6 +6,8 @@
 #
 # Guard against accidental introduction of new Boost dependencies.
 
+export LC_ALL=C
+
 EXPECTED_BOOST_INCLUDES=(
     boost/algorithm/string.hpp
     boost/algorithm/string/classification.hpp
diff --git a/test/lint/lint-tests.sh b/test/lint/lint-tests.sh
--- a/test/lint/lint-tests.sh
+++ b/test/lint/lint-tests.sh
@@ -7,6 +7,8 @@
 #
 # Check the test suite naming conventions
 
+export LC_ALL=C
+
 TOPDIR=${TOPDIR:-$(git rev-parse --show-toplevel)}
 
 NAMING_INCONSISTENCIES=$(git grep -E '^BOOST_FIXTURE_TEST_SUITE\(' -- \